refs #162 `default_monitor` should consider the estimator verbosity

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[codecov-io]

Current coverage is 89.49%

Merging #163 into master will not affect coverage as of 3d2328e

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  Files           27      27       
  Stmts         1076    1076       
  Branches       168     168       
  Methods          0       0       
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  Hit            963     963       
  Partial         54      54       
  Missed          59      59       

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[mmourafiq]

I signed it!

[googlebot]

CLAs look good, thanks!

[ilblackdragon]

Thanks, FYI - code actually moved to http://github.com/tensorflow/tensorflow and that update is already there https://github.com/tensorflow/tensorflow/blob/master/tensorflow/contrib/skflow/python/skflow/monitors.py#L41